Fix #1617: Better encoded file id generation

CHANGE.md

@@ -5,6 +5,7 @@ Change Log: `bootstrap-fileinput`
 
 **Date**: _under development_
 
+- (enh #1617): Better encoded file id generation.
 - (enh #1612, #1614): Remove unsupported script-inline from template and CSP buffer.
 
 ## version 5.1.2

js/fileinput.js

@@ -111,7 +111,7 @@
             if (!relativePath) {
                 return null;
             }
-            return (file.size + '_' + relativePath.replace(/\s/img, '_'));
+            return (file.size + '_' + encodeURIComponent(relativePath).replace(/%/g, '_'));
         },
         getFrameSelector: function (id, selector) {
             selector = selector || '';